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CXR Larus 80-100-400 Issue 2 July 2006 page
3-24
NOTE:
The output driver cards (Models 54571 through 54577) will not deliver an output whose
frequency is within specification until the track and hold card has completed its warmup cycle
following plug-in or power turn-on.
3.3536 Acquisition
Times:
a. From power-up, after warmup time:
1200 seconds (ACQUIRE 1 state), followed by 1000 seconds (ACQUIRE 2
state). Thus, initial entry into normal tracking mode is 42 minutes from cold start
(5 minutes plus 2200 seconds).
b. From HOLD state returning to normal tracking:
1000 seconds (ACQUIRE 2 state).
3.3537 Settling
Time:
10,000 seconds in normal tracking state
3.3538 Output
Signals:
a. 1.544 MHz rubidium derived clock, tracking input reference or holding;
differential backplane signal drives up to ten output cards and one or two 54541
or 54542 Synchronization Monitor Cards.
b. Clock monitor, framed all ones.
c. Hold indication bus to output cards.
d. Combined software/hardware alarm indication to 54560 Alarm Interface Card.
e. Hardware alarm indication to 54550 Information Management Card.
f. Serial data link to 54550 Information Management Card for status, control,
personality, and DS1 sync messaging.
g. One-wire interface used by the 54550 to determine whether or not the 54523 is
installed.
h. Input A/B select to input card.
i. Sync Status Messaging clock and data (DS1 only) to output cards.
j. Serial Data output to transceivers on both input cards.
k. Serial Clock to transceivers on both input cards.
l. Transceiver Select lines to both input cards.
3.3539 LED
Indicators:
Front Panel Label
LED Color
Indication
FAIL Red Card
fail
